League of Legends Match History... Mastery rank WRONG

Played the game a Katarina... got 28/0/8 and etc. ... got an A+... my creep score was great... and etc... how does that equal an A+ ... also turns out 4 of the 5 champs were automated bots (there is a problem with so many automated bots, but that is a discussion for another time lol)... I don't care if I went against 4 bots and 1 player... I at least want an S- for my work... I have gotten an S- on Katarina for a 18/0/7 before same creep score about and same time restraints... The mastery reward system is bullcrap... just wanted to rant some. Thank you for reading my small rant. comment as you wish on it. [zombie-nunu-tears] [zombie-brand-mindblown] [zombie-nunu-bummed]